I'll keep my review (that's what I call rambling about one thing) short since most here already know. The UD is awesome. It literally inspires awe within me.
Cosmetic- It's pretty. Feels great in the hand. Lighter weight than I was expecting, but still feels sturdy. The glass stems are beautiful also. Very well done. Might be a slight exaggeration to those who have never bonded with one of these pups, but they are pieces of art. Functional art.
Function- It's fucking fantastic. The air flow is bananas. I was very used to using a CRZ and this is a big difference. I received the Twig version because I like the heat. I did have a problem of too much heat. Using the nylon stem, I would combust from time to time (zero issue with glass stem and I was hitting it hard as shit). I can't leave a vvps out due to stealth reasons. I had no fear, Underdog came to save the day. Dave sent me an extension cord. A Twig with a 15' extension is the perfect temp for me.
This thing is beasting through the loads. I used to save abv, but not anymore. I feel it's getting everything out. The abv is even darker than the Herbalaire or my past hot running CRZ. Load a stem, pull 2-3 massive clouds, and dump it. I was (and still am) amazed at the hits (strain dependent). It is another level (maybe 2)from "last generation" log vapes.
Summary- I love it. I just do. I had a strong bond with a previous log vape. The fact that the UD not only fills the void, it makes me realize I've been missing something. That's remarkable.
PS: Did I mention great customer service? Very cool to deal with. I love those people for getting a Dog to me. Thanks again guys!